Adena Giant Mound Builders - In the 1800s, reports began to surface of the discovery of very large skeletal remains in the burial mounds of North America. These skeletons were described as reaching seven to eight feet (2.4 meters) in length, with a lower frequency of discoveries spanning nine to 11 feet (3.3 meters) in length, and having very large skulls and gigantic lower jawbones.

Sites of the "Mound Builders" of North America. ...called mounds because they are so eroded when so named, but they were originally pyramids w grand boulevards - Bartram's Travels pub 1791 describes the remains in Florida